I guess what I'm getting at is that it seems difficult to draw the line about what kind of business model you're trying to ban. How would you legislate the difference between water filters and inkjet printers? Even though yes, most of the nontrivial stuff is in the filters themselves, I would think the filter jug is subsidized in some form by the filter, no matter how small the amount.
Another example: Sony sold the PS3 at a loss and recouped the cost through games [1].
If you're concerned about the ecological cost, I think it's better to ban items based on ecological cost (when considering durability and whether it's consumed once or repeatedly) directly. There's no sense in banning certain good printers if they're actually durable. Even your concern with Keurig is not really caused by their base item, but the consumable, right? I think that's the current trend we're following with plastic bags and straws anyway.
Another example: Sony sold the PS3 at a loss and recouped the cost through games [1].
If you're concerned about the ecological cost, I think it's better to ban items based on ecological cost (when considering durability and whether it's consumed once or repeatedly) directly. There's no sense in banning certain good printers if they're actually durable. Even your concern with Keurig is not really caused by their base item, but the consumable, right? I think that's the current trend we're following with plastic bags and straws anyway.
[1] https://arstechnica.com/gaming/2006/11/8239/